基于小型湿喷机施工的喷射混凝土性能评价  

Performance evaluation of shotcrete cast by small scale wet spraying machine

作　　者：宁逢伟[1] 苏安双[1] 丁建彤[2] 白银[1] 杨森[2] 

机构地区：[1]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210029 [2]中国水利水电第七工程局有限公司,四川成都611730

出　　处：《人民长江》2017年第16期67-72,共6页Yangtze River

基　　金：国家重点研发计划课题(2016YFC0401610);江苏省自然科学基金项目(BK20151072);中央级公益性科研院所基本科研业务费专项资金项目(Y416003);中国水利水电第七工程局有限公司项目(2015-458-20)

摘　　要：为研究喷射混凝土性能更接近于现场实际湿喷工况(大型湿喷工艺)的室内浇筑工艺,以9组C40纤维喷射混凝土为例,通过测试其回弹率、一次喷射厚度、凝结时间、密度、抗压强度、弯曲韧性和干缩变形等性能指标,对比了在混凝土拌和物中掺加速凝剂快速搅拌振动成型制作试件(搅拌振动工艺)和应用小型湿喷机喷射施工(小型湿喷工艺)两种工艺下所得混凝土性能之间的差异。结果表明:与搅拌振动工艺相比,小型湿喷工艺成型混凝土试件的凝结时间、密度、抗压强度与大型湿喷工艺更吻合;小型湿喷工艺还能测试回弹率、一次喷射厚度,可用于评价湿喷混凝土的可喷性。To obtain an indoor casting technology of shotcrete that has the closest performance with that of insitu large scalewet spraying,9 kinds of fiber reinforced shotcrete of C40 were taken as an example,and the properties of concrete including rebound rate , build - up thickness , setting time , density , compressive strength , flexural toued to compare the two casting methods,the vibrating - molding process and small scale wet sprasetting time, density and compressive strength of the specimens prepared through small scale wet spraying were more close to those of insitu spraying construction compared with vibrating - molding. And the rebound rate and build - up thickness can be tested by small scale wet spraying test,which can be used to repre sent the shootability of shotcrete.

关 键 词：喷射混凝土 小型湿喷机 搅拌振动工艺 大型湿喷工艺 

分 类 号：TV431[水利工程—水工结构工程]